org.web3j.crypto.Hash类的使用及代码示例

x33g5p2x  于2022-01-20 转载在 其他  
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本文整理了Java中org.web3j.crypto.Hash类的一些代码示例，展示了Hash类的具体用法。这些代码示例主要来源于Github/Stackoverflow/Maven等平台，是从一些精选项目中提取出来的代码，具有较强的参考意义，能在一定程度帮忙到你。Hash类的具体详情如下：
包路径：org.web3j.crypto.Hash
类名称：Hash

Hash介绍

[英]Cryptographic hash functions.
[中]加密散列函数。

代码示例

代码示例来源：origin: web3j/web3j

/**
 * Keccak-256 hash function.
 *
 * @param input binary encoded input data
 * @return hash value
 */
public static byte[] sha3(byte[] input) {
  return sha3(input, 0, input.length);
}

代码示例来源：origin: web3j/web3j

public static byte calculateChecksum(byte[] initialEntropy) {
  int ent = initialEntropy.length * 8;
  byte mask = (byte) (0xff << 8 - ent / 32);
  byte[] bytes = sha256(initialEntropy);
  return (byte) (bytes[0] & mask);
}

代码示例来源：origin: web3j/web3j

/**
 * Checksum address encoding as per
 * <a href="https://github.com/ethereum/EIPs/blob/master/EIPS/eip-55.md">EIP-55</a>.
 *
 * @param address a valid hex encoded address
 * @return hex encoded checksum address
 */
public static String toChecksumAddress(String address) {
  String lowercaseAddress = Numeric.cleanHexPrefix(address).toLowerCase();
  String addressHash = Numeric.cleanHexPrefix(Hash.sha3String(lowercaseAddress));
  StringBuilder result = new StringBuilder(lowercaseAddress.length() + 2);
  result.append("0x");
  for (int i = 0; i < lowercaseAddress.length(); i++) {
    if (Integer.parseInt(String.valueOf(addressHash.charAt(i)), 16) >= 8) {
      result.append(String.valueOf(lowercaseAddress.charAt(i)).toUpperCase());
    } else {
      result.append(lowercaseAddress.charAt(i));
    }
  }
  return result.toString();
}

代码示例来源：origin: web3j/web3j

public static Bip32ECKeyPair generateKeyPair(byte[] seed) {
  byte[] i = hmacSha512("Bitcoin seed".getBytes(), seed);
  byte[] il = Arrays.copyOfRange(i, 0, 32);
  byte[] ir = Arrays.copyOfRange(i, 32, 64);
  Arrays.fill(i, (byte) 0);
  Bip32ECKeyPair keypair = Bip32ECKeyPair.create(il, ir);
  Arrays.fill(il, (byte) 0);
  Arrays.fill(ir, (byte) 0);
  return keypair;
}

代码示例来源：origin: web3j/web3j

private byte[] getIdentifier() {
  return sha256hash160(getPublicKeyPoint().getEncoded(true));
}

代码示例来源：origin: web3j/web3j

data.put(parentPublicKey);
data.putInt(childNumber);
byte[] i = hmacSha512(getChainCode(), data.array());
byte[] il = Arrays.copyOfRange(i, 0, 32);
byte[] chainCode = Arrays.copyOfRange(i, 32, 64);
byte[] i = hmacSha512(getChainCode(), data.array());
byte[] il = Arrays.copyOfRange(i, 0, 32);
byte[] chainCode = Arrays.copyOfRange(i, 32, 64);

代码示例来源：origin: org.web3j/crypto

private byte[] getIdentifier() {
  return sha256hash160(getPublicKeyPoint().getEncoded(true));
}

代码示例来源：origin: web3j/web3j

public static byte[] getAddress(byte[] publicKey) {
  byte[] hash = Hash.sha3(publicKey);
  return Arrays.copyOfRange(hash, hash.length - 20, hash.length);  // right most 160 bits
}

代码示例来源：origin: web3j/web3j

private static byte[] hashTwice(byte[] input) {
  return sha256(sha256(input));
}

代码示例来源：origin: web3j/web3j

@Test
public void testSha3String() {
  assertThat(Hash.sha3String(""),
      is("0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470"));
  assertThat(Hash.sha3String("EVWithdraw(address,uint256,bytes32)"),
      is("0x953d0c27f84a9649b0e121099ffa9aeb7ed83e65eaed41d3627f895790c72d41"));
}

代码示例来源：origin: org.web3j/crypto

public static Bip32ECKeyPair generateKeyPair(byte[] seed) {
  byte[] i = hmacSha512("Bitcoin seed".getBytes(), seed);
  byte[] il = Arrays.copyOfRange(i, 0, 32);
  byte[] ir = Arrays.copyOfRange(i, 32, 64);
  Arrays.fill(i, (byte) 0);
  Bip32ECKeyPair keypair = Bip32ECKeyPair.create(il, ir);
  Arrays.fill(il, (byte) 0);
  Arrays.fill(ir, (byte) 0);
  return keypair;
}

代码示例来源：origin: web3j/web3j

private static byte[] generateMac(byte[] derivedKey, byte[] cipherText) {
  byte[] result = new byte[16 + cipherText.length];
  System.arraycopy(derivedKey, 16, result, 0, 16);
  System.arraycopy(cipherText, 0, result, 16, cipherText.length);
  return Hash.sha3(result);
}

代码示例来源：origin: web3j/web3j

public static byte[] sha256hash160(byte[] input) {
    byte[] sha256 = sha256(input);
    RIPEMD160Digest digest = new RIPEMD160Digest();
    digest.update(sha256, 0, sha256.length);
    byte[] out = new byte[20];
    digest.doFinal(out, 0);
    return out;
  }
}

代码示例来源：origin: org.web3j/crypto

/**
 * Checksum address encoding as per
 * <a href="https://github.com/ethereum/EIPs/blob/master/EIPS/eip-55.md">EIP-55</a>.
 *
 * @param address a valid hex encoded address
 * @return hex encoded checksum address
 */
public static String toChecksumAddress(String address) {
  String lowercaseAddress = Numeric.cleanHexPrefix(address).toLowerCase();
  String addressHash = Numeric.cleanHexPrefix(Hash.sha3String(lowercaseAddress));
  StringBuilder result = new StringBuilder(lowercaseAddress.length() + 2);
  result.append("0x");
  for (int i = 0; i < lowercaseAddress.length(); i++) {
    if (Integer.parseInt(String.valueOf(addressHash.charAt(i)), 16) >= 8) {
      result.append(String.valueOf(lowercaseAddress.charAt(i)).toUpperCase());
    } else {
      result.append(lowercaseAddress.charAt(i));
    }
  }
  return result.toString();
}

代码示例来源：origin: org.web3j/crypto

data.put(parentPublicKey);
data.putInt(childNumber);
byte[] i = hmacSha512(getChainCode(), data.array());
byte[] il = Arrays.copyOfRange(i, 0, 32);
byte[] chainCode = Arrays.copyOfRange(i, 32, 64);
byte[] i = hmacSha512(getChainCode(), data.array());
byte[] il = Arrays.copyOfRange(i, 0, 32);
byte[] chainCode = Arrays.copyOfRange(i, 32, 64);

代码示例来源：origin: web3j/web3j

public static String buildEventSignature(String methodSignature) {
    byte[] input = methodSignature.getBytes();
    byte[] hash = Hash.sha3(input);
    return Numeric.toHexString(hash);
  }
}

代码示例来源：origin: web3j/web3j

public static Credentials loadBip39Credentials(String password, String mnemonic) {
  byte[] seed = MnemonicUtils.generateSeed(mnemonic, password);
  return Credentials.create(ECKeyPair.create(sha256(seed)));
}

代码示例来源：origin: eclipse/winery

contract.getContractAddress()).
  addSingleTopic(EventEncoder.encode(event)).
  addOptionalTopics(Hash.sha3String(identifier)).
  addNullTopic();
final CompletableFuture<List<ModelProvenanceElement>> result = new CompletableFuture<>();

代码示例来源：origin: web3j/web3j

/**
 * Keccak-256 hash function that operates on a UTF-8 encoded String.
 *
 * @param utf8String UTF-8 encoded string
 * @return hash value as hex encoded string
 */
public static String sha3String(String utf8String) {
  return Numeric.toHexString(sha3(utf8String.getBytes(StandardCharsets.UTF_8)));
}

代码示例来源：origin: web3j/web3j

/**
 * Generates a BIP-39 compatible Ethereum wallet. The private key for the wallet can
 * be calculated using following algorithm:
 * <pre>
 *     Key = SHA-256(BIP_39_SEED(mnemonic, password))
 * </pre>
 *
 * @param password Will be used for both wallet encryption and passphrase for BIP-39 seed
 * @param destinationDirectory The directory containing the wallet
 * @return A BIP-39 compatible Ethereum wallet
 * @throws CipherException if the underlying cipher is not available
 * @throws IOException if the destination cannot be written to
 */
public static Bip39Wallet generateBip39Wallet(String password, File destinationDirectory)
    throws CipherException, IOException {
  byte[] initialEntropy = new byte[16];
  secureRandom.nextBytes(initialEntropy);
  String mnemonic = MnemonicUtils.generateMnemonic(initialEntropy);
  byte[] seed = MnemonicUtils.generateSeed(mnemonic, password);
  ECKeyPair privateKey = ECKeyPair.create(sha256(seed));
  String walletFile = generateWalletFile(password, privateKey, destinationDirectory, false);
  return new Bip39Wallet(walletFile, mnemonic);
}

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